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NXP Semiconductors 74HC240N,652
- Part No.:
- 74HC240N,652
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
74HC240N,652.pdf
- Description:
- IC BUFFER INVERT 6V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,721
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Product details
Overview
74HC240N,652 from Nexperia is an octal inverting 3-state buffer/line driver with dual output enables (1OE, 2OE), operating across 2.0 V to 6.0 V supply. It provides eight buffered, inverted outputs split into two independent 4-bit groups, each controlled by its own enable input. It supports industrial temperature range (−40 °C to +125 °C) and is used in bus interface isolation, memory address/data buffering, and microcontroller I/O expansion.
For engineers reviewing the 74HC240N,652 datasheet, 74HC240N,652 pinout, 74HC240N,652 application, or 74HC240N,652 equivalent, key selection criteria include CMOS-level input compatibility, propagation delay ≤30 ns at 4.5 V, 3-state output leakage <±5 μA, and SO20 package mechanical compatibility with legacy 74-series footprints.
Technical Context
The 74HC240N,652 implements a dual-gated 4-bit inverting buffer architecture: inputs 1A0–1A3 feed outputs 1Y0–1Y3 under control of 1OE; inputs 2A0–2A3 feed outputs 2Y0–2Y3 under control of 2OE. Each output enters high-impedance state when its respective OE is HIGH.
It features clamp diodes on all inputs for overvoltage tolerance, supports JESD7A (2.0–6.0 V) and JESD8C (2.7–3.6 V) compliance, and delivers ±35 mA output drive capability per pin with latch-up immunity >100 mA per JESD78 Class II Level B.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0 V to 6.0 V - Enables direct interface with 3.3 V and 5 V logic systems without level translation. |
| Propagation Delay (tpd) | 9 ns (typ) at VCC = 4.5 V, CL = 15 pF - Supports high-speed bus timing in microcontroller peripheral interfaces. |
| Output Drive Strength | ±35 mA per output - Sufficient to drive 50 Ω transmission lines or multiple TTL loads directly. |
| 3-State Leakage (IOZ) | ±5.0 μA max (−40 °C to +125 °C) - Ensures minimal bus contention current during disable states. |
| Input Thresholds (VIH/VIL) | VIH = 3.15 V, VIL = 1.35 V at VCC = 4.5 V - CMOS-compatible thresholds prevent false triggering in noisy environments. |
| Operating Temperature | −40 °C to +125 °C - Qualified for extended industrial and under-hood embedded applications. |
| ESD Robustness | HBM >2000 V, CDM >1000 V - Reduces risk of handling damage during PCB assembly and field service. |
Pinout & Package
74HC240N,652 is supplied in the SO20 (SOT163-1) plastic small outline package: 20-pin, 7.5 mm body width, 1.27 mm pitch, gull-wing leads. Pin 1 is marked by a notch or index area; thermal pad is not electrically connected.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-LOW output enables - Independently disable Group 1 (pins 12–18) or Group 2 (pins 3–9) to isolate bus segments. |
| 2, 4, 6, 8 | 1A0–1A3 | Inverting data inputs for first 4-bit group - Logic LOW input yields HIGH output; used for address/data inversion before latching. |
| 3, 5, 7, 9 | 2Y0–2Y3 | Inverting outputs for second 4-bit group - Drives downstream bus lines with full CMOS voltage swing and 3-state control. |
| 10 | GND | Ground reference - Must be low-inductance connection to minimize switching noise coupling into outputs. |
| 11, 13, 15, 17 | 2A0–2A3 | Inverting data inputs for second 4-bit group - Electrically identical to 1A0–1A3 but routed to separate output bank. |
| 12, 14, 16, 18 | 1Y0–1Y3 | Inverting outputs for first 4-bit group - Provides isolated, inverted signal path for memory address buffers or display drivers. |
| 20 | VCC | Positive supply - Decoupling capacitor (100 nF ceramic) required within 5 mm of this pin for stable high-speed operation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit groups | Enables selective bus gating: one group can drive while the other remains tri-stated, reducing system-level contention. |
| CMOS-level input compatibility | Accepts rail-to-rail input voltages (0 V to VCC) with VIH ≥70% VCC - eliminates need for external pull-ups in mixed-voltage systems. |
| Input clamp diodes | Allow safe interfacing to signals exceeding VCC (e.g., 12 V sensor outputs) using series current-limiting resistors. |
| High noise immunity | Typical noise margin >1.3 V at VCC = 4.5 V - suppresses false toggling from EMI or crosstalk in dense PCB layouts. |
| JEDEC-compliant packaging | SOT163-1 (SO20) footprint matches legacy 74LS240 and 74ALS240 - enables drop-in replacement without board redesign. |
Applications
| Industrial PLC I/O Expansion | Microcontroller Address Bus Buffering |
|---|---|
Use Scenario: Isolating and driving discrete I/O modules in programmable logic controllers where multiple 4-bit data paths require independent enable control. IC Role / Device Role: Dual-group 3-state buffer providing direction-controlled signal routing between CPU and field I/O cards. Use Value: Enables hot-swap-safe bus arbitration via 1OE/2OE pins, preventing back-driving during module insertion/removal. |
Use Scenario: Driving 8-bit address lines from an 8-bit microcontroller to external memory or peripherals with load-matching requirements. IC Role / Device Role: Inverting line driver that translates MCU output levels to robust CMOS bus signals with controlled edge rates. Use Value: Delivers 35 mA drive strength and <30 ns propagation delay to meet timing budgets for 10 MHz memory access cycles. |
| Legacy System Bus Interface | Test Equipment Signal Conditioning |
Use Scenario: Interfacing modern 3.3 V logic to legacy 5 V parallel buses (e.g., ISA, GPIB) requiring level-shifting and bus contention management. IC Role / Device Role: Voltage-tolerant octal buffer with dual enables supporting bidirectional bus control in mixed-supply systems. Use Value: Input clamp diodes allow direct connection to 5 V buses while powered from 3.3 V, eliminating external level shifters. |
Use Scenario: Conditioning digital stimulus signals in automated test equipment where precise timing, low skew, and channel isolation are critical. IC Role / Device Role: Precision inverting buffer with matched propagation delays (<2 ns skew between channels) and low-output capacitance. Use Value: 3.5 pF input capacitance and 9 ns typical tpd ensure minimal signal distortion and deterministic timing across all eight channels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT240D,652 | TTL-compatible inputs (VIH = 2.0 V min); otherwise identical pinout, timing, and drive. | Required when interfacing to legacy 5 V TTL outputs without level shifters. | Select 74HCT240D,652 only if upstream logic uses standard TTL voltage thresholds. |
| SN74HC240N | Same function and pinout; manufactured by Texas Instruments; wider availability in DIP-20 package. | Preferred for through-hole prototyping or legacy DIP-based designs. | Choose SN74HC240N when SO20 surface-mount is unsuitable and DIP-20 mechanical fit is required. |
Compared with 74HC240N,652, the 74HCT240D,652 offers TTL input compatibility at the cost of slightly higher static current, while SN74HC240N provides identical electrical behavior in a through-hole package-neither is pin-compatible with the SO20 74HC240N,652 due to differing package types.
Availability
74HC240N,652 is available at Aetrix Electronics and suitable for industrial automation, embedded controller design, and legacy system upgrades requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for 74HC240N,652 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Nexperia is a global semiconductor expert delivering high-performance, reliable logic, analog, and MOSFET solutions with leadership in efficiency, miniaturization, and quality.
The 74HC240N,652 belongs to Nexperia's 74HC logic family, engineered for low-power, high-noise-immunity digital interfacing in industrial, computing, and consumer applications demanding wide supply range and robust operation.
FAQ
What is the maximum supply voltage rating for the 74HC240N,652?
The 74HC240N,652 has an absolute maximum supply voltage (VCC) of +7.0 V, but its recommended operating range is 2.0 V to 6.0 V. Operation above 6.0 V risks exceeding internal oxide breakdown limits and is not guaranteed for functionality or reliability. The 74HC240N,652 must be operated within 2.0–6.0 V for compliant performance per its datasheet specifications.
Does the 74HC240N,652 support true bidirectional data flow?
No, the 74HC240N,652 is a unidirectional inverting buffer: data flows only from inputs (1A0–1A3, 2A0–2A3) to outputs (1Y0–1Y3, 2Y0–2Y3). It lacks internal direction control or bus transceiver logic. Bidirectional operation requires external control logic and separate transmit/receive paths. The 74HC240N,652 functions strictly as a one-way signal conditioner with 3-state output control.
Can the 74HC240N,652 be used with 3.3 V microcontrollers?
Yes, the 74HC240N,652 operates reliably at 3.3 V supply and accepts 3.3 V logic levels as valid inputs (VIH ≥ 2.31 V at VCC = 3.3 V). Its CMOS inputs are fully compatible with 3.3 V MCU GPIOs, and its outputs swing rail-to-rail, making it suitable for interfacing with 3.3 V peripherals without level shifters. The 74HC240N,652 maintains specified timing and drive strength across the full 2.0–6.0 V range.
What is the purpose of the two separate output enables (1OE and 2OE) on the 74HC240N,652?
The dual output enables (1OE on pin 1, 2OE on pin 19) independently control the 3-state output drivers for two distinct 4-bit groups: 1OE governs outputs 1Y0–1Y3 (pins 12, 14, 16, 18), while 2OE governs outputs 2Y0–2Y3 (pins 3, 5, 7, 9). This allows selective bus segmentation-for example, enabling one group to drive a memory address bus while holding the other group in high-impedance to isolate a data bus. The 74HC240N,652 thus supports flexible, non-conflicting multi-bus architectures.
Is the 74HC240N,652 pin-compatible with older 74LS240 devices?
Yes, the 74HC240N,652 in SO20 (SOT163-1) package shares identical pin numbering, pin functions, and mechanical footprint with the legacy 74LS240 in SO20. However, it is not a direct functional drop-in: the 74HC240N,652 is inverting (unlike the non-inverting 74LS240), and its CMOS inputs draw negligible current versus TTL inputs. System-level validation of logic polarity and timing is required before substitution. The 74HC240N,652 replaces 74LS240 only when inverting behavior is acceptable or compensated in firmware.
74HC240N,652 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HC
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-DIP
74HC240N,652 FAQ
1.How can I place an order for 74HC240N,652 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC240N,652 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 74HC240N,652 reliable?
The price and inventory of 74HC240N,652 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC240N,652 is usually 5 days.
3.What payment methods are accepted for 74HC240N,652?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC240N,652 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC240N,652?
74HC240N,652 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC240N,652 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 74HC240N,652?
For technical support, including 74HC240N,652 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC240N,652 requirements.
6.How does Aetrix verify that 74HC240N,652 is sourced from the original manufacturer or authorized distributors?
All 74HC240N,652 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 74HC240N,652 meets industry standards.
7.What is the process for return or replacement of 74HC240N,652?
All 74HC240N,652 units undergo pre-shipment inspection (PSI). If there is an issue with 74HC240N,652, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 74HC240N,652 part is unused and in its original packaging.
Return procedure for 74HC240N,652:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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